Control Flow

Kima features minimal built-in control flow. Other, more complex control flow constructs can be created using the [[Effects]] feature

If

let x: Int = 5;

if (x < 10) {
    print("x is less than 10");
}

if (x == 5) {
    print("x=5");
} else if (x == 6) {
    print("x=6");
} else {
    print("x is not 5 or 6");
}

If in Kima functions as you would expect. Give an boolean expression and if it evaluates to true then the body executes. If an else branch is given, then it is executed if the condition is false.

The braces around the statements are not required. They are only there for grouping. If the body only consists of a single statement then you can skip them. For example, the two statements below are equivalent:

if (1 < 2) {
    print("1 < 2");
} else {
    print("1 > 2");
}

if (1 < 2)
    print("1 < 2");
else
    print("1 > 2");

Now, since an if is also a statement, we can use this to chain them into else-ifs.

if (4 > 5) print("4 > 5");
else if (6 > 5) print("4 <=5 and 6 > 5");
else print("Neither is true")

While

While statements, again are no surprise. The boolean expression is evaluated when the while loop is first encountered, if it is true the body executes, then we re-evaluate the expression, and if it is true, repeat.

while (true) {
    print("Printing forever");
}

Similarly to an if, we can skip the braces if the loop contains only a single statement

while (true) print("Printing forever");